When the court enters an order continuing placement, detention, or an alternative to detention infringing upon the juvenile's liberty interest pursuant to section 43-253, upon request of the juvenile, or his or her parent, guardian, or attorney, the court shall hold a hearing within forty-eight hours, at which hearing the burden of proof shall be upon the state to show probable cause that such juvenile is within the jurisdiction of the court. Strict rules of evidence shall not apply at the probable cause hearing. The juvenile shall be released if probable cause is not shown. At the option of the court, it may hold the adjudication hearing provided in section 43-279 as soon as possible instead of the probable cause hearing if held within a reasonable period of time. This section and section 43-255 shall not apply to a juvenile (1) who has escaped from a commitment or (2) who has been taken into custody for his or her own protection as provided in subdivision (2) of section 43-248 in which case the juvenile shall be held on order of the court with jurisdiction for a reasonable period of time.